采用双层辉光等离子表面合金化技术，在TA2纯钛基体表面制备钼梯度改性层，对改性层截面形貌和元素分布进行分析，并研究改性层的微尺度准静态接触力学性能。结果表明：钼梯度改性层均匀致密，厚度约为12.0 μm，由厚度2.7 μm的沉积层与厚度9.3 μm的扩散层组成；钼、钛元素含量沿厚度方向呈梯度变化，改性层与基体形成良好的冶金结合；改性层的硬度和弹性模量分别为13.82，264.00 GPa，比基体的分别增大了10.87，142.38 GPa，改性层具有较高的强度和良好的塑性；当试验载荷为15 N时，微米压入深度接近15 μm，复合硬度和弹性模量与基体的相近，改性层的强化作用完全失效。

The molybdenum gradient modified layer was prepared on the surface of TA2 pure titanium substrate by double glow plasma surface alloying technique. The cross section morphology and element distribution of the modified layer were analyzed, and the microscale quasi-static contact mechanical property of the modified layer were studied. The results show that the molybdenum gradient modified layer was uniform and compact with the thickness of 12 μm, and was composed of the deposition layer with 2.7 μm thickness and the diffusion layer with 9.3 μm thickness. The content of Mo and Ti element changed in gradient along the thickness direction, and the modified layer had a good metallurgical bond with the substrate. The hardness and elastic modulus of the modified layer were 13.82, 142.96 GPa, which were 10.87, 142.38 GPa larger than those of the substrate, respectively, indicating that the modified layer had high strength and good plasticity. When the test load was 15 N, the micro-indentation depth was nearly 15 μm, and the composite hardness and elastic modulus were close to those of the substrate, indicating that the strengthening effect of the modified layer was completely ineffective.